支持的音频播放格式
AAC (AAC-LC)
HE-AAC (v1 and v2)
AC-3 (Dolby Digital) - supported since iOS 9.3
E-AC-3 (Dolby Digital Plus) - supported since iOS 9.3
MP3 (MPEG-1 audio layer 3
ALAC (Apple Lossless)
iLBC (internet Low Bitrate Codec, another format for speech)
IMA4 (IMA/ADPCM)
linear PCM (uncompressed)
µ-law and a-law
支持的音频录制格式
AAC (on supported devices only)
ALAC (Apple Lossless)
iLBC (internet Low Bitrate Codec, for speech)
IMA4 (IMA/ADPCM)
linear PCM
µ-law and a-law
